const 参数集 = new URLSearchParams();
参数集.append('username', 'admin');
参数集.append('password', '12345678');

let 响应 = await fetch('http://117.35.25.150:8000/cms/auth/login', {
    method: 'post',
    body: 参数集,
    headers: {
        'Content-Type': 'application/x-www-form-urlencoded;charset=UTF-8',
    },
    body: 参数集
});
let 数据 = await 响应.json();
console.log(数据);